KEY: U = Unavailablea Estimates as of July 1 except 1980 and 1990, which are
as of April 1, and 2000, which is as of November 1.b 1995 through 2000 data are estimates.c As of July 1 for all years except 1980 and 1990.d Chained 1996 dollars are calculated using chain-type indices,
rather than constant dollars, to measure real GDP. The chain-type method first calculates
the real changes between adjacent years. Annual rates of real changes are then chained
(multiplied) together to obtain the rate of real changes between nonadjacent years.
Chained dollars are preferable to constant dollars, which merely reflect overall price
inflation, because chained dollars capture the effect of changes in the components of GDP.e For 2000, as of December.